How a Meteor Killed the Dinosaurs and How we Know it Happened

In the Cretaceous rock layer 66 million years ago fossils of non avian dinosaurs are abundant but then after it, in the blink of a geological eye they had all but vanished and in the following period the Palaeogene, mammals were much larger and more diverse. It is common knowledge now that the cause of this dinosaur disappearance was a giant meteor the size of a mountain, but how was this actually found out. And how did it change the earth in such a long and far reaching way.

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Sources:
https://www.pnas.org/content/116/17/8190

https://www.pnas.org/content/116/45/22500

https://www.pnas.org/content/108/37/15253

https://science.sciencemag.org/content/339/6120/684/tab-figures-data

https://www.researchgate.net/publication/262629122_The_Chicxulub_multi-ring_impact_crater_Yucatan_carbonate_platform_Gulf_of_Mexico

https://link.springer.com/article/10.1007/s12210-009-0060-x
https://www.jstor.org/stable/236233?seq=1

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